Donald Trump (l) and Judge Aileen Cannon|Gage Skidmore; Southern District of Florida|CC BY-SA 2.0; CC BY-SA 4.0

Judge Aileen Cannon dismissed the criminal case accusing Donald Trump of illegally keeping classified documents at Mar-a-Lago after he left office.

The ruling marks a major win for Trump on the opening day of the Republican National Convention. According to the decision, Special Counsel Jack Smith, who brought the prosecution, was improperly appointed.

The verdict marks a second decisive victory for the former president after the Supreme Court ruled Trump enjoys some immunity from criminal charges.

Smith plans to appeal the decision. According to some experts, he could appeal to remove Judge Cannon, who was appointed by Trump.